Ranzieri Paolo, Girlando Alberto, Tavazzi Silvia, Campione Marcello, Raimondo Luisa, Bilotti Ivano, Brillante Aldo, Della Valle Raffaele G, Venuti Elisabetta
Dip. Chimica G.I.A.F. and INSTM-UdR Parma, Università di Parma, 43100 Parma, Italy.
Chemphyschem. 2009 Mar 9;10(4):657-63. doi: 10.1002/cphc.200800771.
Low-frequency (10-150 cm(-1)) Raman spectra of the low-temperature (LT) and high-temperature (HT) polymorphs of the organic semiconductor alpha-quaterthiophene at 300 and 10 K are reported. Polarized spectra, assisted by quasi-harmonic lattice dynamics (QHLD) calculations, allow characterization of the lattice phonon dynamics and identification of the two phases spectroscopically. The experimental data can be explained by taking into account the coupling between intermolecular (lattice) and low-frequency intramolecular modes. Finally, Raman mapping is used to investigate the phase purity.
报道了有机半导体α-四噻吩的低温（LT）和高温（HT）多晶型物在300 K和10 K下的低频（10 - 150 cm⁻¹）拉曼光谱。在准谐晶格动力学（QHLD）计算的辅助下，偏振光谱能够对晶格声子动力学进行表征，并通过光谱识别这两个相。考虑分子间（晶格）和低频分子内模式之间的耦合，可以解释实验数据。最后，利用拉曼映射研究相纯度。
